Shinkawa LS Series User manual

MANUAL NO. 6G17-087 Rev.1
Published in Jan.2018
LS Series
Linear Variable Differential Transformer
INSTRUCTION MANUAL

FOREWORD LS Series
i
For Use in Safety.....
Thank you for your using our LS Series Linear Variable Differential Transformer (LVDT).
SHINKAWA Sensor Technology applies strict quality control and inspections to ensure the high reliability of
its products.
To assure efficient use, please carefully read both this instruction manual and those of any related equipment
you may be using in combination with the LVDT.
! CAUTION
1. Megger (insulation) test of signal cable
When testing the insulation of the signal cable, be sure to disconnect the cable from the
LVDT and monitor.
After the test, discharge the charged electric load before connecting the cable to the LVDT
and monitor.
2. Extension rod with core
1) Handling of extension rod with core
Insert the extension rod with core straight into the LVDT. The unit will be damaged if the
extension rod is inserted diagonally or subjected to lateral pressure.
2) Insertion direction of extension rod with core
Be sure to insert the extension rod with core from the lead wire side of the LVDT.
If inserted from the opposite side, the unit cannot produce the specified accuracy.
3) Installation of extension rod with core
When the LVDT is used for measuring the valve opening, etc., it is usually not sufficient
to fix the extension rod with setscrews, because these could loosen due to the vibrations
acting on the mount. We, therefore, recommend that you fix the extension rod by welding
or the like.
4) Replacement of extension rod with core
Use the LVDT in combination with a core and extension rod having the same Serial No.
for reasons such as breakage may influence the accuracy or characteristics of the unit.
Therefore, be sure to conduct characteristic check prior to use.
3. Cable outlet of terminal box
The terminal box of the terminal board type LVDT is provided with a ø22 hole for leading out
the cable. When shipped the cable outlet points into the direction opposite to the core
insertion port. It can be changed by 90° from each position to face into any of the other 3
directions (refer to pages 6 and 7) . For this reason, the cable outlet should be located at the
bottom, if at all possible.

FOREWORD LS Series
ii
4. Don’t step on
Never use the LVDT as a step, since this will damage the unit.
The top cover of the terminal board type bearing a below warning sign is square and fixed
with screws at its four corners to the terminal box. Therefore, its position should be changed
as desired in steps of 90 to easily visible location with respect to the installation position of
the LVDT.
5. Environmental limits
Use the LVDT within the specified environmental limits.
If operating temperature condition exceed the maximum guaranteed limit, the irreversible
damage will result.
6. Do not measure insulation resistance and dielectric strength other than those at places
specified.
If measured, transducer damage may result.
7. Do not remodel unit without permission. Otherwise the guarantee can not be made.
8. This unit is designed for use by specialists or persons thoroughly familiar with the field.
9. Make sure that the end user receives this Instruction Manual delivered with the unit.
Before Use.....
When the unit is received, inspect it for damage suffered in transport and check whether it is the item you
ordered. In the unlikely event that it was damaged in transport or does not function according to specifications,
please contact the SHINKAWA Office or dealer nearest you.
Store the unit under the ambient conditions given in the specification.
Avoid places where it is exposed to high humidity or corrosive gases.
取扱注意:NOTICE
足掛禁止:NO STEP

TABLE OF CONTENTS LS Series
iii
1. GENERAL INFORMATION
1.1 GENERAL ······································································································ 1
1.2 OPERATING PRINCIPLE ············································································· 1
2. SPECIFICATIONS
2.1 SPECIFICATIONS ·························································································· 2
2.2 EXTERNAL DIMENSIONS ············································································· 5
3. INSTALLATION
3.1 PROCEDURE ································································································· 6
3.2 CHANGING THE DIRECTION OF
THE TERMINAL BOX CABLE OUTLET ················· 6
4. INTERCONNECTION
4.1 MODEL LS-C AND VM-11P ············································································· 8
4.2 MODEL LS-T AND VM-11P ············································································· 9
4.3 MODEL LS-C , VM-11P AND VM-5G······························································· 10
4.4 MODEL LS-T , VM-11P AND VM-5G ······························································· 11
4.5 MODEL LS-C , VM-11P AND VM-5Y1,2,3 ······················································· 12
4.6 MODEL LS-T , VM-11P AND VM-5Y1,2,3························································ 13
4.7 MODEL LS-C AND VM-21P ············································································· 14
4.8 MODEL LS-T AND VM-21P ············································································· 15
4.9 MODEL LS-C , VM-21P AND VM-5G/VM-5Y··················································· 16
4.10 MODEL LS-T , VM-21P AND VM-5G/VM-5Y ··················································· 17

1. GENERAL INFORMATION LS Series
-1-
1.1 GENERAL
The LS Series Linear Variable Differential Transformers (LVDT) are 3wire type LVDTs which, due to their
highly reliable design, are ideal for measuring the valve opening and thermal case growth on turbines.
• 9 types of strokes from 50 to 450 mm
• Superior vibration resistance
• High linearity of ±0.2%
1.2 OPERATING PRINCIPLE
As shown in Fig. 1, the LS Series LVDTs are 3wire type LVDTs. The two identically wound coils, A-B and
B-C as Fig. 1 are contained in the casing. When the extension rod is operated, the core moves in the coils
across A-B-C as shown Fig. 2 (a), (b) and (c). According to Fig.2 (a), when a constant voltage and constant
frequency signal (VEX) is supplied across coil A-C, the relationship between impedance ZAB across coil A-B
and impedance ZBC across coil B-C becomes ZAB < ZBC, and the relationship between voltage VAB across
coil A-B and voltage VBC across coil B-C becomes VAB < VBC. Similar to above, VAB=VBC in Fig. 2 (b)
and VAB > VBC in Fig.2 (c).
ZAB and ZBC vary in proportion to the displacement of the core. Therefore, a voltage proportional to the
displacement as shown in Fig.2 (d) can be obtained by detecting the difference between VAB and VBC.
They are not rectified before this differential calculation, phase detection is required because the phase is
inverted around the null position and the voltage value becomes symmetrical.
VAB=VBC
ABC
VAB VBC
VAB<VBC VAB>VBC
A B C A B C ABC
(a) 0% (b) 50%(Null position) (c) 100%
Fig. 1 Structure
Fig. 2 Operating Principle
(d) Output characteristic
A B C
Core Extension rod
VEX
100%0% Null
point
|VBC|
|VAB|
|VAB|-|VBC|
0V
+V
-V

2. SPECIFICATIONS LS Series
-2-
2.1 SPECIFICATIONS
2.1.1 LS-C SPECIFICATION
• Sensor
• Transmission cable
LS-
Stroke Thread of extension rod
050 50mm M M5×0.8
100 100mm U 10-32UNF
150 150mm
200 200mm
250 250mm
300 300mm
350 350mm
400 400mm
450 450mm
C
Model Code
LW-
Cable length(L) Temperature
range of cable Connector type Armor
005 5m 055 55m 105 105m 155 155m 205 205m 255 255m A -40 to +80°C R Angle type 0 Without
010 10m 060 60m 110 110m 160 160m 210 210m 260 260m B -40 to +125°C S Straight type 1 With
015 15m 065 65m 115 115m 165 165m 215 215m 265 265m
020 20m 070 70m 120 120m 170 170m 220 220m 270 270m
025 25m 075 75m 125 125m 175 175m 225 225m 275 275m Standard
030 30m 080 80m 130 130m 180 180m 230 230m 280 280m
035 35m 085 85m 135 135m 185 185m 235 235m 285 285m
040 40m 090 90m 140 140m 190 190m 240 240m 290 290m
045 45m 095 95m 145 145m 195 195m 245 245m 295 295m
050 50m 100 100m 150 150m 200 200m 250 250m 300 300m
Max. length LW-A--0 : 300m
LW-B--0 : 150m
LW---1 : 15m
- -
6H17-111 Rev.1

2. SPECIFICATIONS LS Series
-3-
Stroke 50, 100, 150, 200, 250, 300, 350, 400, 450mm
Output voltage Approx. (-0.8 to +0.8V)/full stroke to approx. (-1.3 to +1.3V)/full stroke at relay signal 5Vrms
(
measured with the test circuit
)
Excitation 3kHz, 5 to 20Vrms
Coil Impedance 600±100 (3kHz)
Linearity ±0.2% of 100% stroke, ±1.5% of 110% stroke
(measured with the test circuit)
Operating temperature -40 to +125°C (-40 to +257°F REF.)
Operating humidity range 95% RH or less (noncondensing, non-submerged)
Temperature drift (0.03% of F.S./°C or less
Insulation Resistance More than 10M( at 500VDC (between each pins and body)
Dielectric Strength 1mA or less at 500VAC for one minute (between each pins and body)
Shock Vibration 490m/s
2
(50g REF.) at 2kHz
Standard Cable
3-cond.shielded cable with mating connector (5m, 0.75mm
2
(AWG No.20))
• LW-A-S-0(-40 to +80°C, straight type connector, without armor)
• LW-A-S-1(-40 to +80°C, straight type connector, with armor)
• LW-A-R-0(-40 to +80°C, angle type connector, without armor)
• LW-A-R-1(-40 to +80°C, angle type connector, with armor)
• LW-B-S-0(-40 to +125°C, straight type connector, without armor)
• LW-B-S-1(-40 to +25°C, straight type connector, with armor)
• LW-B-R-0(-40 to +125°C, angle type connector, without armor)
• LW-B-R-1(-40 to +125°C, angle type connector, with armor)
Connected equipment VM-11P,VM-21P
SPECIFICATIONS
5Vrms, 3kHz, sine wave
current capacity 50mA or more
Smoothing
Circuit
Osc.
A
Output
B
C
LVDT
Core
Tes t Ci rc ui t
6H17-111 Rev.1

2. SPECIFICATIONS LS Series
-4-
2.1.2 LC-T SPECIFICATION
Stroke Thread of extension rod Additional spec.
050 50mm M M5×0.8 1 Hydrogen sulfide spec.
100 100mm U 10-32UNF
150 150mm
200 200mm
250 250mm
300 300mm
350 350mm
400 400mm
450 450mm
Stroke 50, 100, 150, 200, 250, 300, 350, 400, 450mm
Output voltage Approx. (-0.8 to +0.8V)/full stroke to approx. (-1.3 to +1.3V)/full stroke at relay signal 5Vrms
(
measured with the test circuit
)
Excitation 3kHz,5 to 20Vrms
Coil Impedance 600±100(3kHz)
Linearity ±0.2% of 100% stroke, ±1.5% of 110% stroke
(
measured with the test circuit
)
Operating Temperature -40 to +150°C (-40 to +302°F REF.)
Operating humidity range 95% RH or less (noncondensing, non-submerged)
Temperature drift 0.03% of F.S./°C or less
Insulation Resistance More than 10M at 500VDC (between each terminal and body)
Dielectric Strength 1mA or less at 500VAC for one minute (Between each terminal and body)
Shock Vibration 490m/s
2
(50g REF.) at 2kHz
Screws of terminal block M4
Applicable wire gauge 0.75 to 2mm
2
Connected equipment VM-11P,VM-21P
LS- T/DF
SPECIFICATIONS
5Vrms, 3kHz, sine wave
current capacity 50mA or more
Smoothing
Circuit
Osc.
A
Output
B
C
LVDT
Core
Test Circuit
Model Code / Additional Spec. Code( )
No entry if additional
spec. code is not specified.
6H17-113 Rev.1

2. SPECIFICATIONS LS Series
-5-
2.2 EXTERNAL DIMENSIONS
Model LS-050 LS-100 LS-150 LS-200 LS-250 LS-300 LS-350 LS-400 LS-450
Stroke (mm) 50 100 150 200 250 300 350 400 450
A --- --- --- 203 254 279 330 381 432
B 101.6 203.2 311 406 521 616 718 819 921
C --- --- --- 241 292 323 374 425 476
D 63.5 89 114 140 165 206 232 257 282
E 152.4 257 362 470 584 686 787 889 991
F 25.4 25.4 25.4 38 38 44 44 44 44
Dimensions
(mm)
G 25.4 25.4 25.4 38 38 38 38 38 38
Remarks) LS-050, LS-100 and LS-150 are provided with mounting base *2 (shown by broken line) instead of *1.
Models LS-200 to LS-450 are provided with mounting base *1 instead of *2 (shown by broken line)

3. INSTALLATION LS Series
-6-
3.1 PROCEDURE
It is recommended that you use the LS Series Linear Variable Differential Transformer (LVDT) in
combination with the VM-11P/VM-5E, VM-11P/VM-5A or in the configuration shown in Fig.3.
A connection example for combination with the VM-11P/VM-5E, VM-5A is shown on page 8. If you use
LVDT in combination with the VM-11P/VM-5E, VM-11P/VM-5A, please also carefully read the instruction
manual of the VM-11P/VM-5E, VM-11P/VM-5A.
The null position which lies in the center (50% point) of the measuring range is marked substitutively in white
on the extension rod.
When aligned it with the end of the case, this mark can be used as a rough standard for the null position. The
exact electric null position is the point where the output voltage in the circuit shown in Fig.3 is 0V.
Changing the cable length slightly affects sensitivity. In case of a 0.75mm23-core shielded cable, for instance,
the sensitivity decreases by approx. 0.03% for every additional meter of cable length.
When the cable length exceeds 300m, linearity will begin to get worse.. Therefore please keep the cable
length below 300m.
3.2 CHANGING THE DIRECTION OF THE TERMINAL BOX CABLE OUTLET
The terminal box of the terminal board type LVDT is provided with a φ 22 hole for leading out the cable.
When shipped the cable outlet points into the direction opposite to the core insertion port as shown in Fig.5.
However it can be changed by 90°to face into any of the other 3 directions by following the procedures. Also
refer to Fig.6.
1) Loosen the top cover setscrew ( 1 ), and take off the top cover ( 2 ).
2) Loosen the terminal box setscrew ( 5 ) inside the terminal box, and take the terminal box ( 4 ) off the
terminal board mounting base ( 9 ).
3) Both the terminal box ( 4 ) and the terminal board mounting base ( 9 ) are 72×72mm square, so that the
cable outlet (10) can be pointed into the desired direction by turning it in steps of 90°. After having made
the adjustment, fix the terminal box ( 4 ) with the terminal box setscrews ( 5 ) on the terminal board
mounting base ( 9 ).
4) Install the top cover ( 2 ) with the top cover setscrews ( 1 ) on top of the terminal box ( 4 ).